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AU776634B2 - Drilling bit for drilling while running casing - Google Patents

Drilling bit for drilling while running casing Download PDF

Info

Publication number
AU776634B2
AU776634B2 AU20158/01A AU2015801A AU776634B2 AU 776634 B2 AU776634 B2 AU 776634B2 AU 20158/01 A AU20158/01 A AU 20158/01A AU 2015801 A AU2015801 A AU 2015801A AU 776634 B2 AU776634 B2 AU 776634B2
Authority
AU
Australia
Prior art keywords
drill bit
drilling
hard
casing
drill
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
AU20158/01A
Other versions
AU2015801A (en
Inventor
Mike Wardley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Weatherford Technology Holdings LLC
Original Assignee
Weatherford Lamb Inc
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from GBGB9930287.9A external-priority patent/GB9930287D0/en
Priority claimed from GB0018309A external-priority patent/GB0018309D0/en
Application filed by Weatherford Lamb Inc filed Critical Weatherford Lamb Inc
Publication of AU2015801A publication Critical patent/AU2015801A/en
Application granted granted Critical
Publication of AU776634B2 publication Critical patent/AU776634B2/en
Assigned to WEATHERFORD TECHNOLOGY HOLDINGS, LLC reassignment WEATHERFORD TECHNOLOGY HOLDINGS, LLC Alteration of Name(s) in Register under S187 Assignors: WEATHERFORD/LAMB INC.
Anticipated expiration legal-status Critical
Expired legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E21B10/55—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits with preformed cutting elements
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B10/00—Drill bits
    • E21B10/46—Drill bits characterised by wear resisting parts, e.g. diamond inserts
    • E21B10/54—Drill bits characterised by wear resisting parts, e.g. diamond inserts the bit being of the rotary drag type, e.g. fork-type bits
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B17/00—Drilling rods or pipes; Flexible drill strings; Kellies; Drill collars; Sucker rods; Cables; Casings; Tubings
    • E21B17/14—Casing shoes for the protection of the bottom of the casing
    • E—FIXED CONSTRUCTIONS
    • E21—EARTH OR ROCK DRILLING; MINING
    • E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
    • E21B7/00—Special methods or apparatus for drilling
    • E21B7/20—Driving or forcing casings or pipes into boreholes, e.g. sinking; Simultaneously drilling and casing boreholes

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Geology (AREA)
  • Mining & Mineral Resources (AREA)
  • Physics & Mathematics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Fluid Mechanics (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Mechanical Engineering (AREA)
  • Earth Drilling (AREA)

Description

WO 01/46550 PCT/GBOO/04936 DRIILING BIT FOR DRILLING WHILE RUNNING CASING 2 3 The present invention relates to drilling tools as are 4 typically used for drilling well bores.
6 Conventionally, when drilling a well bore of the type used 7 in oil or gas production, a string of drill pipe having a 8 drill bit on the lower end thereof is advanced into the 9 ground. As the drill is advanced into the ground it encounters different rock formations, some of which may be 11 unstable. To minimise problems which may be incurred by 12 running the drill bit from one formation to another, it is 13 common practice to run the drill bit to a predetermined 14 depth, and then remove or "trip" the drill string from the bore. Structural casing, typically made of heavy steel 16 piping, is then lowered into the bore and cemented in place 17 when set. The casing acts as a lining within the bore, and 18 prevents collapse of the newly drilled bore or 19 contamination of the oil or gas reservoir.
21 As a consequences of having to carry out the above 22 procedure, the cost and time taken to drill a bore is WO 01146550 PCT/GB00/04936 2 1 increased as it is necessary to perform a number of trips 2 down the well. It will be appreciated that at the 3 considerable depths reached during oil and gas production 4 the time taken to implement complex retrieval procedures to recover the drill string can be very long, and accordingly 6 the beginning of profitable production can be greatly 7 delayed.
8 9 An attempt has been made to mitigate this problem with the introduction of a procedure known as "drilling with 11 casing". This procedure relies on the attachment of a 12 drill bit to the actual casing string, so that the drill 13 bit functions not only to drill the earth formation, but 14 also to guide the casing into the well bore. This is advantageous as the casing is pulled into the bore by the 16 drill bit, and therefore negates the requirement of having 17 to retrieve the drill string and drill bit after reaching a 18 target depth to allow cementing.
19 While this procedure greatly increases the efficiency of 21 the drilling procedure, a further problem is encountered 22 when the casing is cemented upon reaching the desired 23 depth. The advantage of drilling with casing is that the 24 drill bit does not have to be retrieved from the well bore.
However as a result, should drilling to a greater depth be 26 required after cementing the casing, the subsequent drill 27 bit has to pass through the previous bit in order to 28 advance. This is extremely difficult as drill bits are 29 required to remove hard rock material and are accordingly very resistant and robust structures typically manufactured 31 from materials such as Tungsten Carbide or steel.
32 Attempting to drill through an old drill bit may result in WO 01146550 PCT/GB00/04936 3 1 damaging the new drill bit, adversely affecting the 2 efficiency of any further drilling. Consequently, the 3 damaged drill bit would have to be retrieved from the bore 4 and replaced, and the time and cost advantage gained by using the drilling with casing procedure would be lost.
6 7 It would therefore be a distinct advantage to provide a 8 drill bit for use during drilling with casing which can 9 drill rock and earth formations but which can also be drilled through by another drill bit. The provision of a 11 drill bit which allows the passage of a subsequent drill 12 bit through it, would reduce the number of trips into a 13 well bore required during a normal drilling procedure and 14 minimise the risk of damaging any further drill bits introduced into the bore.
16 17 In our prior Patent Application PCT/GB99/01816 we have 18 suggested that the drill bit has hard drilling material 19 that may be moved away from the remaining body of the drill shoe prior to subsequent drilling through of the drill bit.
21 We have also proposed EP0815342, a drill bit or shoe having 22 hard drilling material placed only on the drill shoe or bit 23 at the peripheral circumference thereof, and specifically 24 only at the sides of the drill bit or shoe where the diameter is greater than the internal diameter of the 26 casing. The present invention is distinguished from both of 27 these teachings in that it provides for a drill shoe or bit 28 that has hard material within the area below the internal 29 boundaries of the casing, and does net require moving parts to be displaced before subsequent drilling through can be 31 commenced.
32 4 It is an object of the present invention to provide a drill bit for use in a well bore which can drill earth and rock formations and guide a casing string into a well bore simultaneously.
It is a further object of the present invention to provide a drill bit for use in a well bore which is constructed from a material which allows a second drill bit to drill through it.
It is a yet further object of the present invention to provide a drill bit for use in a well bore which allows a second drill bit to drill through it, such that the second drill bit is not damaged and can progress beyond the point reached by the original drill bit within the well bore.
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oooo e• °o According to a first aspect of the present invention there is disclosed a drill bit for drilling with casing in a well bore, said drill bit being constructed from a combination of a relatively soft material and a relatively hard material, wherein the hard material is suitable for cutting earth and rock, and wherein the combination of materials is in such proportion and in such arrangement to allow a subsequent further drill bit, suitable for cutting earth and rock, to drill through said drill bit, wherein said drill bit comprises a nose constructed from aluminium, copper, or brass alloy, a relatively soft intermediate of a material different from the nose material but amenable thereto and disposed on the nose, and cutters of relatively hard material attached to the nose.
o* •go go *ooo **oo go* According to a second aspect of the present invention there is disclosed a method for drilling a well bore, said method comprising attaching the abovementioned drill bit to a casing, drilling a bore through the earth formation and subsequently running a further drill bit in the well inside the casing and drilling through the first drill bit.
*e In order to provide a better understanding of the invention, example embodiments of the invention will now be illustrated with reference to the following Figures in which: Figure 1 illustrates a drill bit in accordance with the present invention, Figure 2 is an elevated view of the top of the drill bit, Figure bit, 3 illustrates an individual cutting member isolated from the drill fe
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Figure 4 illustrates an elevated view of the top of an alternative embodiment of a drill bit in accordance with the present invention, and 8 Figure 5 illustrates a pre-formed element for attaching to the nose portion of a drill bit.
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a 0 a. a a a 0@ WO 01/46550 PCT/GB00/04936 9 1 Referring firstly to Figure 1, a drill bit generally 2 depicted at i, is comprised of a cylindrical body 2, that 3 can be mounted on the lower end of a casing string (not 4 shown) via a thread end connection 3 that can mate with the casing. The drill bit 1 is further comprised of a 6 plurality of cutting members 4 which are fixed to the 7 opposite end of the body 2 to the thread end connection 3, 8 namely the nose end 5. The cutting members 4 extend out 9 from the nose end I0 11 The nose 5 and cutting members 4 are constructed from a 12 material such as aluminium, copper or brass alloy which is 13 soft enough to allow the aforementioned nose 5 and members 14 4 to be drilled through by a second and subseque.t drill bit (not shown). The cutting members 4 are substantially 16 covered by a relatively hard material 6 typically being a 17 hard material such as tungsten carbide or a superhard 18 material such as diamond composite or cubic boron nitride.
19 In the depicted embodiment the relatively hard material 6 is located at the "leading edge" of the cutting member 4.
21 In this respect the "leading edge" refers tc the side of 22 the cutting member 4 which directly contacts the ground or 23 rock upon rotation of the drill bit i. It is recognised 24 that whilst in the depicted embodiments the hard wearing material is afforded to the leading edge of one or more 26 cutting members 4 on the drill bit i, the invention is not 27 limited to this configuration. For example the hard 28 wearing material may be applied to the nose 5 in an 29 embodiment having no cutting members 4 or may be applied to the whole surface of the cutting members 4.
31 WO 01/46550 PCT/GB00/04936 I The relatively hard material 6 may be applied to the 2 cutting members 4 or nose 5 as a coating, that is as a 3 layer or film. In one embodiment a continuous layer of the 4 material 6 may cover the entire surface of the nose 5, or the cutting members 4. Alternatively a non-continuous 6 layer of the material may coat the nose 5 or cutting 7 members 4. In this instance, the surface of the nose 5 or 8 cutting members 4 will comprise areas that are not coated.
9 However, upon rotation of the drill bit i, the cumulative effect of the coated areas will be complete circumferential 11 coverage of the inside diameter of the casing in which the 12 drill bit is located.
13 14 It is recognised in the present invention that direct application of some coatings to the nose material may not 16 be practical. For example, extremely hard tungsten carbide 17 particles cannot be applied to the preferred nose materials 18 aluminium or copper) by lasercarb welding. This 19 material can be applied to soft nickel, however machining said drill bit 1 entirely from nickel would be unduly 21 expensive. Therefore in an alternative embodiment, a 22 coating of the hard material 6 is applied to an 23 intermediate, typically being nickel substrate, which is 24 then attached to the nose 5 of the drill bit i.
Alternatively the nickel substrate can be attached to the 26 nose 5 prior to coating.
27 28 In a further embodiment preformed elements of the hard or 29 superhard material 6 are applied to the nose 5 or cutting members 4 of the drill bit 1 in place of a coating cf film.
31 Said preformed elements may be chips, or fragments of the 32 hard material 6. Typically the culmative effect of the WO 01/46550 PCT/GB00/04936 11 1 preformed elements is to cover the surface of the nose 5 or 2 the cutting members 4 and so act as a coating thereof. The 3 preformed elements may be directly applied to the nose 5 or 4 cutting members 4 or may be applied after applying an amenable material either to the nose 5 or cutting members 4 6 or the preformed element itself. The amenable material is 7 typically nickel substrate.
8 9 The layout of cutting members 4 can be seen more clearly in Figure 2 which shows the nose end 5, viewed from above, and 11 in Figure 3 which shows an individual cutting member 4. It 12 can be seen in Figure 3 that the cutting means 6 has teeth 13 formations 10 which allow any "chips" of material remaining 14 in the well bore to pass through the blade structure.
16 The nose 5 further comprises flow by areas 7 that allow 17 fluid circulated within the well bore to lubricate the 18 surfaces of the bit 1. The body 2 also comprises a 19 stabiliser or centraliser 9 which maintains the drill bit in the centre of the well bore, and reaming members 8, 21 which function to remove any irregularities or obstructions 22 from the wall of the bore.
23 24 In use, the drill bit 1, is run into a well bore (not shown) from the surface, typically whilst being rotated.
26 The drill bit 1 pulls a casing string (not shown) as it is 27 advanced into the newly formed well bore to a predetermined 28 depth. Upon reaching this depth, the casing is cemented to 29 strengthen the lining of the bore. If drilling beycnd this first assembly is required, a second drill bit of a smaller 31 diameter to the first is run into the well inside the 32 casing string from the surface.
WO 01146550 PCT/GBOO/04936 12 2 Upon reaching the first assembly, the new drill bit can 3 drill through the soft drillable material of the original 4 drill bit 1 and cutting members 4, and therefore can proceed to a point beyond the depth reached by the original 6 drill bit 1 within the well bore. The hard or super hard 7 material 6 fixed to the cutting members 4 of the original 8 drill bit 1 disintegrate into shavings when drilled. The 9 shavings released into the well bore when the original bit 1 is drilled through do not obstruct the bore and are 11 therefore not detrimental to the subsequent drilling 12 process. In this manner a further section of the bore can 13 be drilled beyond the previously attained depth without 14 damage to the new drill bit and without needing to retrieve the first assembly from the bore.
16 17 When used for drilling through harder formations a thicker 18 section of the preformed element will be required. However 19 it will be appreciated that in such an instance, said preformed elements would not be drillable. Thereby in the 21 event that a thicker element is required, said element is 22 typically pre-weakened prior to attachment to the nose 5 or 23 cutting members 4. In this manner, the elements will have 24 the attributes of high stiffness whilst drilling but low resistance to fracture whilst being drilled. The pre- 26 formed elements can then be applied directly to the nose 27 or cutting members 4 by brazing or shrink-fitting or could 28 be attached to an amenable material, typically nickel 29 substrate.
31 A first method for fixing the hard or suoerhard material 6 32 is now outlined. A jet is used to blow gases at very nigh WO 01/46550 PCT/GB00/04936 13 1 speeds towards a cast or block of the cutting member 4 or 2 nose 5, and which is made from the soft, drillable 3 material. Typically a speed in the region of Mach 2 is 4 used. Very fine particles of the hard or superhard wearing material are introduced into the gas stream. The resulting 6 kinetic energy is converted to thermal energy in the 7 particles, and accordingly the heated particles "weld" to 8 the leading edge of the cast or block therefore forming a 9 thin layer or film.
11 It will be appreciated that the abovedescribed method could 12 be used with particles of the hard or superhard material, 13 or with intermediates coated by the hard or super hard 14 material or with preformed elements as described above.
16 An alternative method for fixing preformed hard or 17 superhard particles to the cutting members 4 is to place 18 them within a drill mould. Molten drillable soft material 19 that will eventually become the nose 5 of the drill bit 1 is then poured into the mould. On cooling the metal 21 provides a drill bit 1 that has the hard or superhard 22 particles set in situ.
23 24 The present invention is inherent with significant advantages in that the time taken for the drilling 26 operation can be greatly reduced as there is no need to 27 implement complex and timely retrieval operations to 28 recover apparatus from the bore. As a result the 29 profitable stage of production can be begin much sooner.
31 A further advantage, is that unlike the drill bits known to 32 the arz, the drill bit of the present invention is WO 01/46550 PCT/GB00/04936 14 1 drillable by another drill bit and the risk of damage to 2 the second drill bit is therefore reduced. Furthermore as 3 the cutting means of the cutting members consist of fine 4 layers or cutting elements formed from hard material, they disintegrate into shavings upon drilling and therefore do 6 not act as an obstruction to any subsequent apparatus that 7 is advanced into the well.
8 9 Further modifications and improvements may be incorporated without departing from the scope of the invention herein 11 intended.

Claims (12)

  1. 2. A drill bit as claimed in claim 1, wherein the hard material is tungsten carbide.
  2. 3. A drill bit as claimed in claim 1, wherein the hard material is diamond composite.
  3. 4. A drill bit as claimed in claim 1, wherein the hard material is cubic boron nitride. A drill bit as claimed in any one of the preceding claims and comprising a plurality of different hard materials.
  4. 6. A drill bit as claimed in any one of the preceding claims wherein the hard material is provided as a coating.
  5. 7. A drill bit as claimed in claim 6, wherein the coating is a continuous layer or film.
  6. 8. A drill bit as claimed in claim 6, wherein the coating is non-continuous, such that surfaces of the drill bit are afforded areas which are not coated by the hard S material, wherein upon rotation of the drill bit, the cumulative effect of the coated areas gives complete circumferential coverage of the dimensions of the drilled well bore.
  7. 9. A drill bit as claimed in any one of the preceding claims, wherein the intermediate rOe is nickel. oo 0-04 10. A drill bit as claimed in any one of the preceding claims also comprising a plurality of flow ports to allow fluid bypass and lubrication of the bit. 1 I. A drill bit as claimed in any one of the preceding claims also comprising a stabilizer or centraliser.
  8. 12. A drill bit as claimed in any one of the preceding claims also comprising reaming members. 3067T
  9. 13. A method for drilling a well bore, said method comprising attaching a drill bit in accordance with any one of claims 1 to 12 to casing, drilling a bore through the earth formation and subsequently running a further drill bit in the well inside the casing and drilling through the first drill bit.
  10. 14. A drill bit for drilling with casing in a well bore, said drill bit being substantially as herein described with reference to Figs. 1, 2 and 3 or Figs. 1, 3 and 4 of the drawings. A method of fixing a hard or super hard wearing material to a drill bit nose made of soft drillable material, said method being substantially as herein described with reference to the drawings.
  11. 16. A method of drilling utilizing a drill bit in accordance with any one of claims 1-12.
  12. 17. A well drilled in accordance with the method of claim 16. Dated this 2 7 th day of July 2004 WEATHERFORD/LAMB, INC. By FRASER OLD SOHN Patent Attorneys for the Applicant *o ooo o 3067T
AU20158/01A 1999-12-22 2000-12-21 Drilling bit for drilling while running casing Expired AU776634B2 (en)

Applications Claiming Priority (5)

Application Number Priority Date Filing Date Title
GB9930287 1999-12-22
GBGB9930287.9A GB9930287D0 (en) 1999-12-22 1999-12-22 Casing drilling bit
GB0018309A GB0018309D0 (en) 2000-07-27 2000-07-27 Casing drilling bit
GB0018309 2000-07-27
PCT/GB2000/004936 WO2001046550A1 (en) 1999-12-22 2000-12-21 Drilling bit for drilling while running casing

Publications (2)

Publication Number Publication Date
AU2015801A AU2015801A (en) 2001-07-03
AU776634B2 true AU776634B2 (en) 2004-09-16

Family

ID=26244723

Family Applications (1)

Application Number Title Priority Date Filing Date
AU20158/01A Expired AU776634B2 (en) 1999-12-22 2000-12-21 Drilling bit for drilling while running casing

Country Status (7)

Country Link
US (1) US7216727B2 (en)
EP (1) EP1242711B1 (en)
AU (1) AU776634B2 (en)
CA (1) CA2393754C (en)
DE (1) DE60030159D1 (en)
NO (1) NO325412B1 (en)
WO (1) WO2001046550A1 (en)

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US20020189863A1 (en) 2002-12-19
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WO2001046550A1 (en) 2001-06-28
NO20022831L (en) 2002-06-14

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